public RelDataType resolveColumn(String name, SqlNode ctx) {
final SqlValidatorNamespace selectNs = validator.getNamespace(select);
final RelDataType rowType = selectNs.getRowType();
final RelDataTypeField field = validator.catalogReader.field(rowType, name);
if (field != null) {
return field.getType();
}
final SqlValidatorScope selectScope = validator.getSelectScope(select);
return selectScope.resolveColumn(name, ctx);
}
/**
* Resolves a multi-part identifier such as "SCHEMA.EMP.EMPNO" to a namespace. The returned
* namespace may represent a schema, table, column, etc.
*
* @pre names.size() > 0
* @post return != null
*/
public static SqlValidatorNamespace lookup(SqlValidatorScope scope, List<String> names) {
Util.pre(names.size() > 0, "names.size() > 0");
SqlValidatorNamespace namespace = null;
for (int i = 0; i < names.size(); i++) {
String name = names.get(i);
if (i == 0) {
namespace = scope.resolve(name, null, null);
} else {
namespace = namespace.lookupChild(name);
}
}
Util.permAssert(namespace != null, "post: namespace != null");
return namespace;
}
public SqlMonotonicity getMonotonicity(SqlCall call, SqlValidatorScope scope) {
return scope.getMonotonicity(call.operand(0)).unstrict();
}